<template>
  <div class="cmt-container">
      <h3>发表评论</h3>
    <hr>
    <textarea placeholder="请输入要BB的内容（做多吐槽120字）" maxlength="120" v-model="msg"></textarea>

    <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>

    <div class="cmt-list">
      <div class="cmt-item" v-for="(item, i) in comments" :key="i">
        <div class="cmt-title">
          第{{ i+1 }}楼&nbsp;&nbsp;用户：{{ item.user_name }}&nbsp;&nbsp;发表时间：{{ item.add_time | dateFormat }}
        </div>
        <div class="cmt-body">
          {{ item.content === 'undefined' ? '此用户很懒，嘛都没说': item.content }}
        </div>
      </div>

    </div>

    <mt-button type="danger" size="large" @click="getMore">加载更多</mt-button>
  </div>
</template>

<script>
import { Toast } from "mint-ui"
export default {
  data(){
    return {
      comments:[], //所有评论数据
      pageIndex : 1 ,  //分页默认为1
      msg: ''
    }
  },
  created(){
    this.getComments()
  },
  methods:{
    getComments(){
      this.$http.get('api/getcomments/'+this.id+'?pageindex='+this.pageIndex).then(result => {
        if(result.body.status === 0){
            this.comments = [...this.comments,...result.body.message]
            // this.comments = this.comments.concat(result.body.message)  也可以实现数组的合并
            
        }else{
          Toast('请求数据失败')
        }
      })
    },
    getMore(){
      this.pageIndex++
      this.getComments()
    },
    postComment(){
      this.$http.post("api/postcomment/" + this.$route.params.id,  {content: this.msg.trim()}).then(result => {
        if (this.msg.trim().length === 0) {
          return Toast('评论不能为空')
        }
        if (result.body.status === 0) {
        // 数据提交成功后,将发送的数据组装成一个消息对象,拼接到当前数据最前面
        var cmt = {
          user_name: "匿名用户",
          add_time: Date.now(),
          content: this.msg.trim()
        };
        this.comments.unshift(cmt);
        this.msg = "";
      }
      })
    }
  },
  props:['id']  
}
</script>

<style lang="scss" scoped>
  .cmt-container {
  h3 {
    font-size: 18px;
  }
  textarea {
    font-size: 14px;
    height: 85px;
    margin: 0;
  }

  .cmt-list {
    margin: 5px 0;
    .cmt-item {
      font-size: 13px;
      .cmt-title {
        line-height: 30px;
        background-color: #ccc;
      }
      .cmt-body {
        line-height: 35px;
        text-indent: 2em;
      }
    }
  }
}
</style>
